{"affected":[{"affectedData":[{"product":"moby","vendor":"moby","versions":[{"status":"affected","version":"< 19.03.15"},{"status":"affected","version":">= 20.0.0, < 20.10.3"}]}],"source":"security-advisories@github.com"}],"configurations":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:docker:docker:*:*:*:*:*:*:*:*","matchCriteriaId":"C6B22016-AB78-4E82-9F65-AEC2526F3EDF","versionEndExcluding":"19.03.15","vulnerable":true},{"criteria":"cpe:2.3:a:docker:docker:*:*:*:*:*:*:*:*","matchCriteriaId":"B4427D14-D219-490B-8467-40FE253775A1","versionEndExcluding":"20.10.3","versionStartIncluding":"20.0.0","vulnerable":true}],"negate":false,"operator":"OR"}]},{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*","matchCriteriaId":"07B237A9-69A3-4A9C-9DA0-4E06BD37AE73","vulnerable":true}],"negate":false,"operator":"OR"}]},{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:a:netapp:e-series_santricity_os_controller:*:*:*:*:*:*:*:*","matchCriteriaId":"BD1E9594-C46F-40D1-8BC2-6B16635B55C4","versionEndIncluding":"11.60.3","versionStartIncluding":"11.0.0","vulnerable":true}],"negate":false,"operator":"OR"}]}],"cveTags":[],"descriptions":[{"lang":"en","value":"In Docker before versions 9.03.15, 20.10.3 there is a vulnerability involving the --userns-remap option in which access to remapped root allows privilege escalation to real root. When using \"--userns-remap\", if the root user in the remapped namespace has access to the host filesystem they can modify files under \"/var/lib/docker/<remapping>\" that cause writing files with extended privileges. Versions 20.10.3 and 19.03.15 contain patches that prevent privilege escalation from remapped user."},{"lang":"es","value":"En Docker versiones anteriores a 9.03.15, 20.10.3, se presenta una vulnerabilidad que involucra la opción --userns-remap en la que un acceso a una root reasignada permite una escalada de privilegios a la root actual.&#xa0;Cuando se usa \"--userns-remap\", si el usuario root en el espacio de nombres reasignado tiene acceso al sistema de archivos del host, puede modificar archivos en \"/var/lib/docker/(remapping)\" que causa la escritura de archivos con privilegios extendidos.&#xa0;Las versiones 20.10.3 y 19.03.15 contienen parches que evitan una escalada de privilegios del usuario reasignado"}],"id":"CVE-2021-21284","lastModified":"2026-06-17T03:35:11.603","metrics":{"cvssMetricV2":[{"acInsufInfo":false,"baseSeverity":"LOW","cvssData":{"accessComplexity":"LOW","accessVector":"ADJACENT_NETWORK","authentication":"SINGLE","availabilityImpact":"NONE","baseScore":2.7,"confidentialityImpact":"NONE","integrityImpact":"PARTIAL","vectorString":"AV:A/AC:L/Au:S/C:N/I:P/A:N","version":"2.0"},"exploitabilityScore":5.1,"impactScore":2.9,"obtainAllPrivilege":false,"obtainOtherPrivilege":false,"obtainUserPrivilege":false,"source":"nvd@nist.gov","type":"Primary","userInteractionRequired":false}],"cvssMetricV31":[{"cvssData":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"NONE","baseScore":6.8,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","version":"3.1"},"exploitabilityScore":2.3,"impactScore":4.0,"source":"security-advisories@github.com","type":"Secondary"},{"cvssData":{"attackComplexity":"LOW","attackVector":"ADJACENT_NETWORK","availabilityImpact":"NONE","baseScore":6.8,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N","version":"3.1"},"exploitabilityScore":2.3,"impactScore":4.0,"source":"nvd@nist.gov","type":"Primary"}]},"published":"2021-02-02T18:15:11.827","references":[{"source":"security-advisories@github.com","tags":["Release Notes","Vendor Advisory"],"url":"https://docs.docker.com/engine/release-notes/#20103"},{"source":"security-advisories@github.com","tags":["Patch","Third Party Advisory"],"url":"https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c"},{"source":"security-advisories@github.com","tags":["Release Notes","Third Party Advisory"],"url":"https://github.com/moby/moby/releases/tag/v19.03.15"},{"source":"security-advisories@github.com","tags":["Release Notes","Third Party Advisory"],"url":"https://github.com/moby/moby/releases/tag/v20.10.3"},{"source":"security-advisories@github.com","tags":["Third Party Advisory"],"url":"https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc"},{"source":"security-advisories@github.com","tags":["Patch","Third Party Advisory"],"url":"https://security.gentoo.org/glsa/202107-23"},{"source":"security-advisories@github.com","tags":["Third Party Advisory"],"url":"https://security.netapp.com/advisory/ntap-20210226-0005/"},{"source":"security-advisories@github.com","tags":["Third Party Advisory"],"url":"https://www.debian.org/security/2021/dsa-4865"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Release Notes","Vendor Advisory"],"url":"https://docs.docker.com/engine/release-notes/#20103"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Third Party Advisory"],"url":"https://github.com/moby/moby/commit/64bd4485b3a66a597c02c95f5776395e540b2c7c"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Release Notes","Third Party Advisory"],"url":"https://github.com/moby/moby/releases/tag/v19.03.15"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Release Notes","Third Party Advisory"],"url":"https://github.com/moby/moby/releases/tag/v20.10.3"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"url":"https://github.com/moby/moby/security/advisories/GHSA-7452-xqpj-6rpc"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Patch","Third Party Advisory"],"url":"https://security.gentoo.org/glsa/202107-23"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"url":"https://security.netapp.com/advisory/ntap-20210226-0005/"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Third Party Advisory"],"url":"https://www.debian.org/security/2021/dsa-4865"}],"sourceIdentifier":"security-advisories@github.com","vulnStatus":"Modified","weaknesses":[{"description":[{"lang":"en","value":"CWE-22"}],"source":"security-advisories@github.com","type":"Secondary"},{"description":[{"lang":"en","value":"CWE-22"}],"source":"nvd@nist.gov","type":"Primary"}]}